Dishwashing cleaning composition

Abstract

A dishwashing composition including a copolymer including polyalkylene oxide groups and quaternary nitrogen atoms and a complexing agent system comprising citrate.

What is claimed is: 
     
       1. A dishwashing cleaning composition comprising a cationic copolymer, wherein the copolymer comprises:
 i. from about 60% to about 99% by weight of at least one monoethylenically unsaturated polyalkylene oxide monomer of the formula I (monomer (A)) 
 
       
         
           
           
               
               
           
         
         in which the variables have the following meanings: 
         X is —CH2- or —CO—, if Y is —O—; 
         is —CO—, if Y is —NH—; 
         Y is —O— or NH—; 
         R1 is hydrogen or methyl; 
         R2 are identical or different C2-C6-alkylene radicals; 
         R3 is H or C1-C4 alkyl; 
         n is an integer from 20 to 100, 
         ii. From about 1% to about 40% by weight of at least one quaternized nitrogen-containing monomer, selected from the group consisting of at least one of the monomers of the formula IIa to IId (monomer (B)) 
       
       
         
           
           
               
               
           
         
         in which the variables have the following meanings: 
         R is C1-C4 alkyl or benzyl; 
         R is hydrogen or methyl; 
         Y is —O— or —NH—; 
         A is C1-C6 alkylene; 
         X— is halide, C1-C4-alkyl sulfate, C1-C4-alkylsulfonate and C1-C4-alkyl carbonate, 
         iii. from 0% to about 15% by weight of at least one anionic monoethylenically unsaturated monomer (monomer (C)), and 
         iv. from 0% to about 30% by weight of at least one other nonionic monoethylenically unsaturated monomer (monomer (D)), 
         and organic complexing agent system comprising citrate and a complexing agent selected from the group consisting of methyl glycine diacetic acid, glutamic-N,N-diacetic acid, iminodisuccinic acid, carboxy methyl inulin, their salts, and mixtures thereof. 
       
     
     
       2. The dishwashing cleaning composition according to  claim 1  wherein the complexing agent system comprises a salt of methyl glycine diacetic acid. 
     
     
       3. The dishwashing cleaning composition according to  claim 1  wherein the complexing agent system comprises citrate and a salt of methyl glycine diacetic acid in a weight ratio of from about 0.5:1 to about 2:1. 
     
     
       4. The dishwashing cleaning composition according to  claim 1  wherein the copolymer has a weight average molecular weight (Mw) from about 10,000 g/mol to about 200,000 g/mol. 
     
     
       5. The dishwashing cleaning composition according to  claim 1  in which the variables of monomer (A) have the following meanings:
 X is —CO—; 
 Y is —O—; 
 R1 is hydrogen or methyl; 
 R2 is ethylene, linear or branched propylene or mixtures thereof; 
 R3 is methyl; 
 n is an integer from 30 to 60. 
 
     
     
       6. The dishwashing cleaning composition according to  claim 1  where the cationic copolymer comprises from about 60% to about 98% by weight of monomer (A) and from about 1% to about 39% by weight of monomer B and from about 0.5% to about 6% by weight of monomer (C). 
     
     
       7. The dishwashing cleaning composition according to  claim 1  wherein monomer (A) is methylpolyethylene glycol (meth)acrylate. 
     
     
       8. The dishwashing cleaning composition according to  claim 1  wherein monomer (B) is a salt of 3-methyl-1-vinylimidazolium. 
     
     
       9. The dishwashing cleaning composition according to  claim 1 , where the cationic copolymer comprises from about 69% to about 89% of monomer (A) and from about 9% to about 29% of monomer (B). 
     
     
       10. The dishwashing cleaning composition according to  claim 1  wherein monomer (A) is methylpolyethylene glycol (meth)acrylate and wherein monomer (B) is a salt of 3-methyl-1-vinylimidazolium. 
     
     
       11. The dishwashing cleaning composition according to  claim 1  wherein the weight ratio of monomer (A) to monomer (B) is 2:1 and for the case where the copolymer comprises a monomer (C), the weight ratio of monomer (B) to monomer (C) is also ≥2:1, and monomer (A) comprises methylpolyethylene glycol (meth)acrylate and monomer (B) comprises a salt of 3-methyl-1-vinylimidazolium. 
     
     
       12. The dishwashing cleaning composition according to  claim 1  wherein the composition is an automatic dishwashing composition comprising from about 0.1% to about 10% of the copolymer by weight of the composition and the composition is phosphate free. 
     
     
       13. The dishwashing cleaning composition according to  claim 1  wherein the composition comprises a dispersant polymer. 
     
     
       14. The dishwashing cleaning composition according to  claim 1  wherein the composition comprises a carboxylated/sulfonated polymer. 
     
     
       15. The dishwashing cleaning composition according to  claim 1  wherein the composition comprises bleach. 
     
     
       16. The dishwashing cleaning composition according to  claim 1  wherein the composition comprises a bleach catalyst. 
     
     
       17. The dishwashing cleaning composition according to  claim 1  wherein the composition is an automatic dishwashing composition comprising:
 a) from about 0.1% to about 10% of copolymer by weight of the composition; 
 b) from about 10% to 60% by weight of the composition of the complexing agent system; and 
 c) from 0% to about 10% by weight of the composition of a dispersant polymer. 
 
     
     
       18. The dishwashing cleaning composition according to  claim 1  wherein the composition is in unit dose form. 
     
     
       19. A method of reducing the number of spots on dishware during automatic dishwashing, the method comprising the following steps:
 a) providing soiled dishware; 
 b) placing the soiled dishware into an automatic dishwasher; 
 c) providing an automatic dishwashing cleaning composition according to  claim 1 ; and 
 d) running the automatic dishwasher, wherein the copolymer in the automatic dishwashing cleaning composition contributes to the reduction of number of spots on dishware. 
 
     
     
       20. A method of washing soiled dishware in a dishwasher to provide visual and tactile cleaning comprising the steps of:
 a) providing the soiled dishware; 
 b) treating the dishware with a cleaning composition comprising the composition of  claim 1 ; and 
 optionally rinsing the dishware.